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High temperature spin reorientation, magnetization reversal and magnetocaloric effect in 50% Mn substituted polycrystalline ErFeO3
P. Neenu Lekshmi,
Published in Academic Press Inc.
2019
Volume: 279
   
Abstract
The structural, magnetic and magnetocaloric properties of 50% Mn substituted ErFeO3 are studied by X-ray diffraction, magnetization and specific heat measurements. ErFe0.5Mn0.5O3 crystallizes in an orthorhombic structure (Pbnm). DC magnetization and specific heat studies point to two magnetic transitions: (i) Fe3+/Mn3+ ordering, TN ~ 245 K and (ii) spin re-orientation transition, TSR ~ 218 K. Below TSR, ErFe0.5Mn0.5O3 exhibits a reduction in magnetization and coercivity which could be due to a Γ4-Γ1 magnetic transition. Interestingly, we have observed a negative magnetization in field cooled curves at lower temperatures under lower applied fields (<50 Oe) as a result of the polarization of paramagnetic Er3+ moments with the internal field created by Mn3+ ordering from the Mn-rich regions. A significant magnetic entropy change (-ΔSm) of 13.4 J/kg.K is also observed at 9.5 K for an applied field of 7 T. © 2019
About the journal
JournalJournal of Solid State Chemistry
PublisherAcademic Press Inc.
ISSN00224596
Open AccessNo
Concepts (17)
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    Entropy
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    Erbium compounds
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    Iron compounds
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    Magnetocaloric effects
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    Manganese
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    Rare earths
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    Specific heat
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    Thermal variables measurement
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    Isothermal magnetic entropy change
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    Magnetic entropy change
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    Magnetic transitions
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    Magnetocaloric properties
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    Negative magnetization
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    Orthorhombic structures
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    RARE EARTH ORTHOFERRITES
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    Spin reorientation
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    Magnetization reversal